Preheat the oven to 400°F/ 200°C. Line the baking tray with parchment paper.
Prepare asparagus: Wash and dry the spears, removing the tougher woody ends. Lightly coat the asparagus spears with olive oil and sprinkle them with a little salt.2 lbs green asparagus/ 1 kg + 1 tablespoon olive oil + fine sea salt
Form the bundles by wrapping about 4-6 asparagus spears (depending on their thickness) in one or two bacon slices (depending on their size as well). Place the asparagus bundles on the prepared baking tray and sprinkle with some freshly ground black pepper.4-8 bacon slices + freshly ground black pepper
Roast in the oven for about 12 minutes. If the asparagus spears are very thin, start checking after 10 minutes or so. If they are thicker, they might need about one or two extra minutes. Check by piercing with a fork, they should be softer, but still have a bite. Serve immediately.
Notes
My bacon is very thin and narrow, so I used 2 slices for each bundle. If your bacon is wider, one slice should be enough.